Quote Originally Posted by Martialartsnovice
The war with Japan started before the instances you quoted in the post I have referenced above. The conflicts started with Japan and China when Kabula Khan of the Gengis Khan family line, sent Two Naval/Calvary Invasions to the Japanese Islands. Though both invasions were unsuccesful due to a storm at Sea. Anyway after these attempted conquests, is when Japan began its self-imposed isolation. This to me seems the most logical explaination of the conflicts and as to the origins of the Naval Ensignia.
Let's take this with measure then.

First of all, there is no connection between China in 1895 and the Mongol invasion of 1274 and 1281. It's just too distant in time and type of society, and then Kubilai Khan was a Mongol that first invaded China, not a Chinese.

Secondly, Japan only started its self-imposed isolation from the Edo period (seclusion from 1639 to 1854), not after the 13th century failed Mongol invasion. One of the reason Japan closed itself to the West (except the Netherlands), was that the Portuguese had tried to introduce Christianity and other dangerous ideas. Contrarily to popular beliefs, Japan was not closed to the whole world, and continued trading with China and Korea during that period. More information on this subject here.